Peaceful location finally lost identity (6)
I believe the answer is:
placid
'peaceful' is the definition.
(I've seen this in another clue)
'location finally lost identity' is the wordplay.
'location' becomes 'place' (a location is a place).
'finally lost' means to remove the last letter.
'identity' becomes 'id' (abbreviation).
'place' with its final letter removed is 'plac'.
'plac'+'id'='PLACID'
(Other definitions for placid that I've seen before include "mild" , "Composed or serene" , "Calm, peaceful" , "Calm and still" , "Calm and tranquil" .)